HP MSR Router Series Wan Access Configuration Manual page 24

Step
4. Configure the device to
accept the DNS server IP
addresses assigned by the
peer even though it does not
request the peer for the DNS
server IP addresses.
Configuring the local end as the server
•
Step
1. Enter system view.
2. Enter interface view.
3. Specify the primary and
secondary DNS server IP
addresses to be allocated to
the peer in PPP negotiation.
Configuring ACCM negotiation
PPP uses the escape mechanism on asynchronous links to avoid treating payload characters as control
characters. The escape mechanism converts all one-byte asynchronous control characters into two-byte
characters. This mechanism increases the size of asynchronous control characters and reduces the
payload size.
The ACCM configuration option provides a method to negotiate with the peer of the local control
characters, which must be converted on asynchronous links. The ACCM field contains 32 bits numbered
1 to 32 from left to right. Each bit corresponds to an asynchronous control character numbered the same.
If the value of a bit is 0, the system does not convert the corresponding asynchronous control character.
If the value of a bit is 1, the system converts the corresponding asynchronous control character by
prefacing it with a backslash (\). For example, if the value of the bit numbered 19 is 0, the asynchronous
control character numbered 19 (DC3, Control-S) will be sent without being converted.
ACCM negotiation is implemented at the LCP negotiation stage. After ACCM negotiation is completed,
the peer converts asynchronous control characters according to the Async Control Character Mappings
when sending packets.
By default, the ACCM field takes the value of 0x000A0000. To increase the payload size on low-rate
links, set the ACCM field to 0x0 so the system does not convert asynchronous control characters.
To configure ACCM negotiation:
Step
1. Enter system view.
2. Enter interface view.
Command
ppp ipcp dns admit-any
Command
system-view
interface interface-type
interface-number
ppp ipcp dns
primary-dns-address
[ secondary-dns-address ]
Command
system-view
interface interface-type
interface-number
15
Remarks
By default, a device does not
accept the DNS server IP
addresses assigned by the peer
if it does not request the peer for
the DNS server IP addresses.
This command is not necessary if
the ppp ipcp dns request
command is configured.
Remarks
N/A
N/A
By default, a device does not
allocate DNS server IP addresses
to its peer if the peer does not
request them.
Remarks
N/A
N/A